function y = pbs(x)
%Powell badly scaled function
%n=2,m=2,x0=[0,1]
%fmin1=f3([1.098*10^(-5);9.106])=0
%Author:Ji Lin
y1=10^4*x(1)*x(2)-1;
y2=exp(-x(1))+exp(-x(2))-1.0001;
y=y1^2+y2^2;